subArray record: prevent posting unneeded updates on CA

Bug #1858826 reported by Martin Konrad on 2020-01-08
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
EPICS Base
Undecided
Martin Konrad

Bug Description

By default waveform records always post updates. The rationale behind that is that the EPICS developers didn't want to keep another copy of the array around for comparing (waveforms can be huge). However, in case of the waveform record the IOC can also keep a 32-bit hash of the array data around to determine if the data changed. This behaviour can be controlled by the APST and MPST field. Let's add this feature to the subArray record as well.

Changed in epics-base:
assignee: nobody → Martin Konrad (info-martin-konrad)
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